how do i clear my c drive from the cmd?

[sunshinekid]

how do i clear my c drive? i was putting cipher /w:c:\ but that didnt work.

 

[Guest]

If by clear you mean erase I think you're looking for this: http://www.ehow.com/how_6520364_erase-hard-drive-command-prompt.html
If you want to optimize and clean you pc (make it run faster) I recommend this CCleaner: http://www.piriform.com/ccleaner

 

[Hawkeye22]

If the C drive is your OS drive, you won't be able to format it from within windows or a windows command prompt. You need to boot from a live linux cd or something and format from there.